EP0396485A2 - Strichkodeleser mit grosser Schärfentiefe - Google Patents

Strichkodeleser mit grosser Schärfentiefe Download PDF

Info

Publication number
EP0396485A2
EP0396485A2 EP90480059A EP90480059A EP0396485A2 EP 0396485 A2 EP0396485 A2 EP 0396485A2 EP 90480059 A EP90480059 A EP 90480059A EP 90480059 A EP90480059 A EP 90480059A EP 0396485 A2 EP0396485 A2 EP 0396485A2
Authority
EP
European Patent Office
Prior art keywords
scanner
bar code
light
code scanner
field
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90480059A
Other languages
English (en)
French (fr)
Other versions
EP0396485A3 (en
EP0396485B1 (de
Inventor
Richard Hunter Harris
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of EP0396485A2 publication Critical patent/EP0396485A2/de
Publication of EP0396485A3 publication Critical patent/EP0396485A3/en
Application granted granted Critical
Publication of EP0396485B1 publication Critical patent/EP0396485B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
    • G06K7/10861—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices sensing of data fields affixed to objects or articles, e.g. coded labels
    • G06K7/10871—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices sensing of data fields affixed to objects or articles, e.g. coded labels randomly oriented data-fields, code-marks therefore, e.g. concentric circles-code
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10792—Special measures in relation to the object to be scanned
    • G06K7/10801—Multidistance reading
    • G06K7/10811—Focalisation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K2207/00—Other aspects
    • G06K2207/1013—Multi-focal

Definitions

  • the present invention relates to optical scanners in general and more particularly to a bar code scanner having a large depth of field and capable of reading high density bar codes over a wide range of distances from the scanner.
  • Optical bar code scanners for use in retail checkout operations at supermarkets and other retail establishments are gaining wider and wider acceptance.
  • the typical bar code scanner is usually mounted within a counter and have a window at the top thereof through which a scanning pattern is projected.
  • the scanning pattern is formed by a laser and associated optical components which produce plural scan lines that intersect in various patterns. If an article imprinted with a bar code, such as the Uniform Product Code (UPC) is placed into the field of the scan pattern and the bar code is scanned by the scan pattern, light is reflected from the bar code back through the scanner window.
  • UPC Uniform Product Code
  • a photodetector converts the reflected light into an electrical signal which is applied to dedicated hardware or to a microprocessor which finds and decodes the symbol into a stream of electrical signals.
  • the signal When the signal has been found and decoded, it is passed onto a point of sale terminal or store controller where it is used to access records that provide a brief description of the item as well as pricing information.
  • the pricing information and item description are used at the point of sale terminal to prepare customer receipt and to calculate transaction totals.
  • the "depth of field” of a scanner is the range of distances over which the scanner can successfully read the smallest bar code label allowed by the standards authority for the particular bar code being read.
  • the range of distances usually extends from the scanner window to one or more focal points in space.
  • the focal points are points in space where the scanning beam is focused by the scanner's optical system.
  • the "depth of field" of a bar code scanner is an indication of the distance, relative to the scanner window, whereat a bar code label can be placed and still be read by the scanner.
  • the scanner has a symmetrical rotat­ing deflector which deflects and focuses a laser beam at a single point above the window of the scanner.
  • the deflec­tor is formed from a plurality of angled single faceted mirrors. Due to the single focal point, this type of scanner has a relatively small "depth of field.”
  • the main object of the present invention to provide a low-cost bar code scanner with a large depth of field.
  • the objective and others are achieved by using a rotating deflector that causes the scanning laser beam to traverse different path lengths within the scanner. As the beam exits the scanner window, it is focused at different points relative to the window. The sum of the focal points creates a large depth of field for the scanner.
  • a scanner constructed in accordance with the present invention includes a coherent light source which generates a light beam.
  • Optical components such as mirrors, etc. fold the light beam onto an asymmet­rical rotating deflector which deflects the light beam and causes it to exit the window and focus at different points above the window.
  • the asymmetrical deflector includes a plurality of facets each with two mirrors angled relative to one another and supported on a hub which is rotated by a motor. As the deflector rotates, each facet reflects the beam from points which are approximately displaced 180 degrees. This causes the beam to travel along different paths and converge (focus) at different points above the window of the scanner.
  • a bar code located anywhere within the overall depth of field of the scanner is read.
  • Fig. 1 shows a schematic of a point of sale system which includes a bar code scanner according to the teachings of the present invention.
  • the point of sale system is nor­mally incorporated in the checkout counter of a store.
  • the top surface 10 of the scanner includes a transparent scanner window 12 through which scanning rays are directed to scan a bar code pattern 15 (such as the UPC code) placed on a grocery item 17.
  • a bar code pattern 15 such as the UPC code
  • the item is brought into the scanning pattern by a checkout clerk (not shown) to enable the pattern to sweep across the code whereupon light reflected from the bar code is received back by components of the scanner which process and decode the bar code bearing signals as is conventional.
  • the scanner components located below the top surface 10 include light source 14, a plurality of beam folding mirrors 16, deflecting device 18, electro/optical device 20, electronic circuit arrangement 22, processor 24 and point of sale terminal 26.
  • light source 14 is a laser which generates a light beam which is focused by lens (not shown) onto deflecting assembly 18.
  • the deflecting assembly 18 is an essential component of the present scanner, and the de­tails will be given hereinafter. Suffice it to say that the deflecting assembly 18 deflects the light beam from at least two displaced points as it is rotated by motor 19 in the direction shown by arrow 21. As a result, the beam is made to travel different distances within the scanner and focuses at different points above the surface of the scanner. As a result, when an article 17 carrying bar code pattern 15 is positioned within the focal area, the laser pattern is reflected from the bar code area back into the scanner.
  • light 21 reflecting from the grocery item may take a retroreflective path through the plurality of beam folding mirrors 16 to the collection lens 28.
  • light rays reflecting from the bar code are shown with broken lines; while light rays from the laser 14 are shown with solid lines.
  • the mirrors direct most of the returning light through a collection lens 28 to a photo detector 30.
  • the photo detector 30 converts the return optical signal to a corresponding electrical signal which is applied to the threshold and shaping circuit 32.
  • the function of the threshold and shaping circuit 32 is to convert the often irregular electrical signals provided by photo detector 30 into a square wave pulse train in which the duration of each pulse is a function of the width of the light or dark area being traversed by the laser beam.
  • the output of the threshold and shaping circuit 32 is applied to a candidate select circuit 34 which isolates any signals representing symbols from the overall string of symbols most of which are optical noise produced when the laser beam traverses text or graphics.
  • Candidates selected in circuit 34 are applied to the processor 24 which selects one of those candidates as a final symbol, decodes that symbol and sends it to the point of sale terminal 26 where price lookup, inventory control, etc. operations are initiated.
  • the folding mirrors, laser, etc. are conventional components which can be arranged in various relationships and the showing in Fig. 1 should not be construed as a limitation on the scope of the present invention.
  • Fig. 2 is a perspective view of a bar code scanner package in accordance with the teachings of the present invention.
  • the top surface of the scanner is removed to show the internal components and their relationship to the laser beam.
  • the scanner includes a housing 40 which supports the internal components of the scanner.
  • a laser device 42 generates a focused laser beam which is routed by folding mirrors 46, 48 and 50 onto deflector assembly 52.
  • the deflector assembly 52 is coupled to a motor 19 which drives the deflector assembly at a speed ( ⁇ ) omega.
  • ⁇ speed omega
  • the reflected beam from the primary deflection point and alternate deflection point is folded by mirror assembly 54 to exit the scanner.
  • the reflected beams are focused at focal planes 41 and 43 outside of the scanner.
  • the depth of fields of these focal planes overlap, and the combina­tion provides a wide depth of field for the scanner.
  • a bar code which is positioned within these over­lapping depth of fields is easily read.
  • the theory of the present invention is to provide a deflector which deflects the beam from multiple deflection points and causes it to travel different path lengths within the scanner.
  • the beam focal point occurs at different points external to the scanner.
  • the scanner is provided with a depth of field which is greater than prior art scanner.
  • Figs. 3 and 4 show schematics of an asymmetrical deflector according to the teachings of ,the present invention.
  • Fig. 3 shows a perspective view of the deflector
  • Fig. 4 shows a side view of the deflector.
  • the asymmetrical deflector includes a disc or support member 55.
  • a plural­ity of deflecting members or deflecting facets 62, 60, 58 and 56 are mounted around the periphery of support member 55.
  • the disc and deflecting members are mounted via opening 61 to the shaft 64 of drive motor 19.
  • the deflect­ing members are angled relative to each other and mirrors are placed on each surface. Stated another way, the deflecting facets consist of two mirrors with each de­flecting the incident laser beam.
  • the end members 62 and 56 may be opaque or non-reflective in the areas identified by numerals 64 and 66, respectively to eliminate double reflection within the deflectors. Another way of describ­ing the deflector assembly is to view it as a symmetrical deflecting polygon with mirrors removed from one side and placed behind the mirrors of the remaining facets. Thus, each facet deflects the laser beam from a primary and an alternative deflection point.
  • each reflecting surface on a facet reflects the beam from at least two points identified in Figs. 3 and 4, as the alternate deflection point and the primary deflection point.
  • facet 60 is positioned at the farthest point of its trajectory relative to the beam (at this point the facet is shown with solid lines in Figs. 3 and 4).
  • the beam is reflected, by the front mirror 60A of facet 60, to traverse one of its paths within the scanner.
  • the back mirror 60B of facet 60 when the back mirror 60B of facet 60 is posi­tioned at the nearest point of its trajectory (at this point the facet shown by broken lines) the back mirror 60B of the facet reflects the beam from its alternate deflec­tion point.
  • farthest and nearest are points relative to laser 42 (Fig. 2).
  • the difference between the path length that the beam will travel within the scanner is approximately equivalent to 2(R1 + R2) where R1 is the distance from the alternate deflection point to the center of disc 55 and R2 is the distance from the center of disc 55 to the primary deflection point.
  • counter masses are used on the disc 55 to balance it so that it is stable as it rotates.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Artificial Intelligence (AREA)
  • Toxicology (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Cash Registers Or Receiving Machines (AREA)
  • Length Measuring Devices By Optical Means (AREA)
EP90480059A 1989-05-01 1990-04-10 Strichkodeleser mit grosser Schärfentiefe Expired - Lifetime EP0396485B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/345,603 US5175421A (en) 1989-05-01 1989-05-01 Dual depth of field deflector for bar code scanners
US345603 1989-05-01

Publications (3)

Publication Number Publication Date
EP0396485A2 true EP0396485A2 (de) 1990-11-07
EP0396485A3 EP0396485A3 (en) 1990-12-12
EP0396485B1 EP0396485B1 (de) 1994-12-28

Family

ID=23355687

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90480059A Expired - Lifetime EP0396485B1 (de) 1989-05-01 1990-04-10 Strichkodeleser mit grosser Schärfentiefe

Country Status (4)

Country Link
US (1) US5175421A (de)
EP (1) EP0396485B1 (de)
JP (1) JPH0786896B2 (de)
DE (1) DE69015428T2 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992012499A1 (en) * 1990-12-27 1992-07-23 Eastman Kodak Company Bar code scanner with a large depth of field
EP0517956A1 (de) * 1991-06-14 1992-12-16 Symbol Technologies, Inc. Optische Abtasteinrichtung mit erweiterter Schärfentiefe
EP0533383A2 (de) * 1991-09-19 1993-03-24 Ncr International Inc. Optische Abtastvorrichtung
EP0539054A1 (de) * 1991-10-23 1993-04-28 Ncr International Inc. Anlage für optische Abtastung
EP0583514A1 (de) * 1992-08-19 1994-02-23 Opticon Sensors Europe B.V. Einstellungsmittel für einen Kodeleser
EP0848344A2 (de) * 1996-12-11 1998-06-17 Datalogic S.P.A. Vorrichtung zum Abtasten eines sich auf einem bewegenden Artikel befindlichen optischen Kodes und Verfahren zum Abtasten eines solchen optischen Kodes mittels dieser Abtastvorrichtung
EP1112522A1 (de) * 1998-09-11 2001-07-04 Polaroid Corporation Optische system veränderlicher brennweite

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5298729A (en) * 1992-02-14 1994-03-29 Ncr Corporation Multiple depth of field optical scanner
JP2789282B2 (ja) * 1992-07-10 1998-08-20 富士通株式会社 光学式マーク読取装置
IL102996A (en) * 1992-08-30 1996-10-31 Scitex Corp Ltd scanner
US6006995A (en) * 1993-10-12 1999-12-28 Metrologic Instruments Inc. System for reading bar code symbol on containers having arbitrary surface geometry
US5719385A (en) * 1995-12-08 1998-02-17 Ncr Corporation Optical scanner having multi-line and single-line scanning modes
US6575368B1 (en) 1996-01-31 2003-06-10 Psc Scanning, Inc. Multiple aperture data reader for multi-mode operation
US5962838A (en) * 1996-07-15 1999-10-05 Psc Scanning, Inc. Barcode scanner with manually switchable scan patterns
US6098887A (en) * 1998-09-11 2000-08-08 Robotic Vision Systems, Inc. Optical focusing device and method
NL1010088C2 (nl) * 1998-09-14 2000-03-15 Scantech Bv Inrichting voor het lezen van streepjescodes.
FR3025913B1 (fr) 2014-09-12 2016-09-09 Biomerieux Sa Dispositif de lecture de codes-barres et machine pour l'analyse automatise d'un echantillon comprenant un tel dispositif

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58202424A (ja) * 1982-05-20 1983-11-25 Ricoh Co Ltd 光ビ−ム偏向装置
US4560862A (en) * 1983-04-26 1985-12-24 Skan-A-Matic Corp. System for optical scanning over a large depth of field
JPS61254921A (ja) * 1985-05-07 1986-11-12 Minolta Camera Co Ltd 光ビ−ム走査装置
EP0206454A2 (de) * 1985-06-12 1986-12-30 Mitsubishi Denki Kabushiki Kaisha Fester Hologrammabtaster
JPS6236627A (ja) * 1985-08-12 1987-02-17 Canon Inc 光学走査装置
JPS62203117A (ja) * 1986-03-03 1987-09-07 Chiyouonpa Kogyo Kk 光ビ−ムのスキヤンニング装置
US4713532A (en) * 1985-11-21 1987-12-15 Metrologic Instruments, Inc. Compact omnidirectional laser scanner
EP0319237A2 (de) * 1987-12-01 1989-06-07 Tokyo Electric Co., Ltd. Leser mit Lichtabtastung
EP0323026A2 (de) * 1987-12-28 1989-07-05 Symbol Technologies, Inc. Optischer Abtaster nach vielen Richtungen

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006343A (en) * 1973-10-23 1977-02-01 Matsushita Electric Industrial Co., Ltd. Code read-out means
NL164685C (nl) * 1974-02-26 1981-01-15 Matsushita Electric Ind Co Ltd Uitleesinrichting voor het aftasten van informatie op een informatiedrager.
JPS5360520A (en) * 1976-11-12 1978-05-31 Nippon Electric Ind Optical scanner for reading bar code
JPS5371842A (en) * 1976-12-07 1978-06-26 Nec Corp Optical scanner
US4587407A (en) * 1983-06-20 1986-05-06 Westinghouse Electric Corp. Scanning system for bar code labels affixed to rods
US4591242A (en) * 1984-02-13 1986-05-27 International Business Machines Corp. Optical scanner having multiple, simultaneous scan lines with different focal lengths
GB8503964D0 (en) * 1985-02-15 1985-03-20 Blackburn A E Piston engines
JPS62147576A (ja) * 1985-12-21 1987-07-01 Oputo Electron:Kk パタ−ン読取装置
US4748316A (en) * 1986-06-13 1988-05-31 International Business Machines Corporation Optical scanner for reading bar codes detected within a large depth of field
US4795224A (en) * 1986-10-06 1989-01-03 Katsuchika Goto Optical scanning pattern generator
US4915465A (en) * 1987-01-30 1990-04-10 Canon Kabushiki Kaisha Laser beam printer using only one side surface of a rotational mirror to scanningly deflect a substantially perpendicular laser beam
US4939355A (en) * 1988-01-22 1990-07-03 Spectra-Physics, Inc. Automatic package label scanner
US5059779A (en) * 1989-06-16 1991-10-22 Symbol Technologies, Inc. Scan pattern generators for bar code symbol readers

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58202424A (ja) * 1982-05-20 1983-11-25 Ricoh Co Ltd 光ビ−ム偏向装置
US4560862A (en) * 1983-04-26 1985-12-24 Skan-A-Matic Corp. System for optical scanning over a large depth of field
JPS61254921A (ja) * 1985-05-07 1986-11-12 Minolta Camera Co Ltd 光ビ−ム走査装置
EP0206454A2 (de) * 1985-06-12 1986-12-30 Mitsubishi Denki Kabushiki Kaisha Fester Hologrammabtaster
JPS6236627A (ja) * 1985-08-12 1987-02-17 Canon Inc 光学走査装置
US4713532A (en) * 1985-11-21 1987-12-15 Metrologic Instruments, Inc. Compact omnidirectional laser scanner
JPS62203117A (ja) * 1986-03-03 1987-09-07 Chiyouonpa Kogyo Kk 光ビ−ムのスキヤンニング装置
EP0319237A2 (de) * 1987-12-01 1989-06-07 Tokyo Electric Co., Ltd. Leser mit Lichtabtastung
EP0323026A2 (de) * 1987-12-28 1989-07-05 Symbol Technologies, Inc. Optischer Abtaster nach vielen Richtungen

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
MESURES REGULATION AUTOMATISME vol.46,nos.8/9, August/September 1981, pages 41, 43,45,47, Paris, FR;"Laser et microprocesseur decryptent des codes à barres dans,l'espace" figure 1 *
MESURES REGULATION AUTOMATISME. vol. 46, nos. 8/9, August/September 1981, pages 41,43,45,47, Paris, FR; "Laser et microprocesseur décryptent des codes à barres dans l'espace". *
PATENT ABSTRACTS OF JAPAN. vol. 11, no. 107 (P-563)(2554) 4 April 1987; & JP-A-61 254 921 (MINOLTA CAMERA CO. LTD.) 12-11-1986 *
PATENT ABSTRACTS OF JAPAN. vol. 11, no. 219 (P-596)(2666) 16 July 1987; & JP-A-62 036 627 (CANON INC.) 17-02-1987 *
PATENT ABSTRACTS OF JAPAN. vol. 12, no. 58 (P-669)(2905) 20 February 1988; & JP-A-62 203 117 (CHIYOUONPA KOGYO K.K.) 07-09-1987 *
PATENT ABSTRACTS OF JAPAN. vol. 8, no. 51 (P-259()1488) 8 March 1984; & JP-A-58 202 424 (RICOH K.K.) 25-11-1983 *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992012499A1 (en) * 1990-12-27 1992-07-23 Eastman Kodak Company Bar code scanner with a large depth of field
EP0517956A1 (de) * 1991-06-14 1992-12-16 Symbol Technologies, Inc. Optische Abtasteinrichtung mit erweiterter Schärfentiefe
EP0533383A2 (de) * 1991-09-19 1993-03-24 Ncr International Inc. Optische Abtastvorrichtung
EP0533383A3 (en) * 1991-09-19 1993-04-14 Ncr International Inc. Optical scanner apparatus
EP0539054A1 (de) * 1991-10-23 1993-04-28 Ncr International Inc. Anlage für optische Abtastung
EP0583514A1 (de) * 1992-08-19 1994-02-23 Opticon Sensors Europe B.V. Einstellungsmittel für einen Kodeleser
US5365049A (en) * 1992-08-19 1994-11-15 Opticon Sensors Europe B.V. Focusing means for a symbol code reader
EP0848344A2 (de) * 1996-12-11 1998-06-17 Datalogic S.P.A. Vorrichtung zum Abtasten eines sich auf einem bewegenden Artikel befindlichen optischen Kodes und Verfahren zum Abtasten eines solchen optischen Kodes mittels dieser Abtastvorrichtung
EP0848344A3 (de) * 1996-12-11 1998-09-02 Datalogic S.P.A. Vorrichtung zum Abtasten eines sich auf einem bewegenden Artikel befindlichen optischen Kodes und Verfahren zum Abtasten eines solchen optischen Kodes mittels dieser Abtastvorrichtung
US6135352A (en) * 1996-12-11 2000-10-24 Datalogic S.P.A. Scanning reader of an optical code placed on an article in movement and a method of scanning said optical code by means of said reader
EP1112522A1 (de) * 1998-09-11 2001-07-04 Polaroid Corporation Optische system veränderlicher brennweite
EP1112522A4 (de) * 1998-09-11 2001-12-19 Robotic Vision Systems Optische system veränderlicher brennweite

Also Published As

Publication number Publication date
JPH02301881A (ja) 1990-12-13
US5175421A (en) 1992-12-29
DE69015428T2 (de) 1995-07-13
EP0396485A3 (en) 1990-12-12
JPH0786896B2 (ja) 1995-09-20
EP0396485B1 (de) 1994-12-28
DE69015428D1 (de) 1995-02-09

Similar Documents

Publication Publication Date Title
EP0396485B1 (de) Strichkodeleser mit grosser Schärfentiefe
EP0295936B1 (de) Anordnung zur Erzeugung eines optischen Abtastrasters für Laserabtaster
KR890002871B1 (ko) 광속(光速) 주사장치
US5073702A (en) Multiple beam bar code scanner
US5693930A (en) Optical scanner having a plurality of scanning systems
KR940010808B1 (ko) 바 코드 리더(Bar code reader)용 레이저 스캐너
US5149949A (en) Optical scanner with counterrotating reflector elements
US5179271A (en) Compact optical scan pattern generator for bar code reading systems
US4591236A (en) Optical scanner with beam directing holograms at window
US5498862A (en) Side scanning bar code reader with vertical and horizontal scan patterns
US5192857A (en) Compact optical scanner rotatable between horizontal and vertical positions
US7552874B2 (en) Optical scanner
JPH0823629B2 (ja) 光学読取装置
US5081364A (en) Multifocal scanning system
CA1224651A (en) Low speed laser scanning apparatus
JP2826240B2 (ja) バーコードリーダ
US4935609A (en) Composite lens for a hand-held bar code label reader
US7051939B2 (en) Bar code scanner with laser beam oscillator
EP0533383A2 (de) Optische Abtastvorrichtung
EP1965336B1 (de) Modul zur optischen Erfassung
JP2576604B2 (ja) レーザ光走査装置
JP2803797B2 (ja) バーコード読取り装置
JP2837664B2 (ja) バーコード読取り装置
EP0528630A2 (de) Optisches Abtastgerät

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE ES FR GB IT

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE ES FR GB IT

17P Request for examination filed

Effective date: 19901213

17Q First examination report despatched

Effective date: 19930811

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR GB IT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19941228

REF Corresponds to:

Ref document number: 69015428

Country of ref document: DE

Date of ref document: 19950209

ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: IBM - DR. ING. FABRIZIO LETTIERI

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19950324

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19950328

Year of fee payment: 6

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19960410

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19960426

Year of fee payment: 7

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19960410

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19961227

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050410